Not sure why you make that conclusion, I do know football is a business. My point is if WC players don't want to be at the club then most likely they won't perform at their WC level, which has nothing to do with being "too romanticized".
I agree with you on needing top players but i'd rather have top players who wants to play for united (not some love dubby crap but a player who won't demand stupid wages just to come here) than players whose sole motivation is gaining stupid wages. IMO Dybala wanting increase in wages to come here is fine (top players will always demand more, nothing wrong with it) but if he wants Sanchez money then he can feck off and it has nothing to do with being "too romanticized" but its good business to not pay stupid wages to convince the player (s) to join. If you go down that route then you end up with players on stupid wages and hard to move on.